Use depth to communicate: phone screen has small and limited design area, iOS uses depth to emphasize the importance of different layers which helps users understand the relationships among onscreen objects. This detailed design is a smart, clear, efficient to communicate with phone users. For example, when you open a folder on the home screen, the folder and its content float up with a translucent background.
User control: iOS UI/UX is clean and simple, straightforward for users to understand and remember how to use the function. When the user feels more in control of an app, the app can be a good one, especially when users know how to correctly respond to different designs, which means the ui/ux design is successfully meet designers’ expectations.
Consider hiding the navigation bar when users want to focus on content: I didn’t pay attention to this detail before, I thought the navigation bar was always there as default. But here is a design that let users focus on content, and hide the navigation bar.